Sensitivity of capsicum germplasm to magnesium deficiency growing in the solution culture

P.T. Nguyen, M.J. Bell, S.M. Harper
Magnesium (Mg) is a macronutrient that plays an important role in numerous physiological processes of plants. Magnesium deficiency is an increasingly severe problem in horticultural production, especially in regions where soil solutions have excessive potassium and calcium concentrations and in acidic soils with low Mg status. Therefore, sufficient supply of Mg is necessary to improve crop yield and quality of harvested products. Capsicum (Capsicum annuum) is an important horticultural crop with high nutritional value and widely cultivated around the world. This study was implemented to evaluate the response of different capsicum genotypes to Mg supply in solution culture. Two solution culture glasshouse experiments evaluated the sensitivity of four capsicum genotypes, including Capsicum annuum ‘Warlock’, and three Capsicum chinense accessions, 42-3-2, 71-3-3, and 40-5-1. At the lowest Mg rate, all genotypes had Mg deficiency symptoms, including interveinal chlorosis on the older leaves. Across treatments, the foliage Mg concentration ranged from 0.9 to 1.7 g kg‑1 dry weight (DW). ‘Warlock’ showed stronger sensitivity to Mg deficiency than did the C. chinense accessions. Interestingly in ‘Warlock’, the uptake of Ca and Zn with increasing Mg supply was substantially greater than that of the other genotypes particularly suggesting potential genetics for increased Zn uptake.
Nguyen, P.T., Bell, M.J. and Harper, S.M. (2023). Sensitivity of capsicum germplasm to magnesium deficiency growing in the solution culture. Acta Hortic. 1375, 137-144
DOI: 10.17660/ActaHortic.2023.1375.18
plant nutrients, genotype, response, symptoms, growth

Acta Horticulturae